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3 years ago

How do you solve 6 7/10 - 2 1/3?

Mathematics

2 answers:

Luba_88 [7]3 years ago

5 0

Answer: 131/30

Step-by-step explanation:

When adding or subtracting fractions, it sometimes helps to make them improper fractions:

6 7/10 becomes 67/10 because 6*10+7 = 67, over 10.

2 1/3 becomes 7/3 because 2*3+1 = 7, over 3.

Now you make the two denominators the same by finding the least common factor between the two denominators:

The LCD of 10 and 3 is 30.

67/10 equals 201/30. They're the same fraction, just the first one is more simplified.

7/3 equals 70/30.

Now that the denominators are the same, you can easily subtract the two. Since you're not multiplying or dividing, the denominator of 30 remains the same. Just subtract the numerators.

201/30 - 70/30 = 131/30

Your answer cannot be simplified any more, but as a mixed number, your answer is 4 11/30.

malfutka [58]3 years ago

3 0

Find the common denominator for 3 and 10 which is 30 now the denominator is 30 and what you do with one side you do to the other so 6 7/10 turns into
6 21/30 and 2 1/3 turns into 2 10/30 now subtract them so 6 21/30-2 10/30=
4 11/30

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And for this case we can use the z score formula given by:

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And using this formula we got:

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Step-by-step explanation:

Previous concepts

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Solution to the problem

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Where $\mu=3.4$ and $\sigma=3.1$

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And for this case we want this probability:

$P(X< 3.4-0.6*3.1) = P(X$

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$z = \frac{x- \mu}{\sigma}$

And using this formula we got:

$P(X$

And we can use the normal standard table or excel and we got:

$P(Z$

Second part

For the other part of the question we want to find the following probability:

$P(-1.715$

And using the score we got:

$P(-1.715$

And we can find this probability with this difference:

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